Hi I've recently had a Goodwe 4.6 installed with 2x3.5kwH Pylontech batteries and 17x365 w panels.  I would like to find out if it is possible to extract data to monitor the kwH into the battery (charging) and then the (discharge) consumption in kwH on a daily basis linked to the batteries. 

Currently battery discharge set to 50%, the plan was to monitor and assess contribution to household power and to increase/decrease discharge.  Typically by 19h00 state of charge = 50%.  Alternatively are there other simple methods than can be used to get handle on this?  On the topic of batteries does anybody know what represents a "cycle" for the Pylontech.  My batteries at the moment charge and discharge several times a day.

Looking forward to a reply.

 

6 hours ago, BGb said:

I would like to find out if it is possible to extract data to monitor the kwH into the battery (charging) and then the (discharge) consumption in kwH on a daily basis linked to the batteries. 

I have the same inverter and batteries and as far as I know it is not possible to get this information from the portal. But based on my experience it is not really important to know. The Pylontech's give you a very accurate SOC which you can use to manage the batteries.

 

6 hours ago, BGb said:

Alternatively are there other simple methods than can be used to get handle on this?

I would set the discharge limit at a much lower SOC (like 20%) to maximize the battery return of investment and achieve the highest PV harvest. The only problem is that you might only have 20% battery capacity left when load shedding hits you. But you can always increase the min SOC if there is a risk of load shedding.

6 hours ago, BGb said:

On the topic of batteries does anybody know what represents a "cycle" for the Pylontech

based on my observation the battery BMS adds up the amount of Ah you discharge and charge and when the sum reaches +- 80% of the battery capacity it increases the cycle count by 1. @Youda is the resident expert on the Pylontech batteries and he can maybe confirm this.

Edited January 24, 20205 yr by Fuenkli

thanks @Fuenkli

With that amount of PV your battery should not discharge during the day!!!

How is you PV panels connected to the inverter?

All 17 in a single string, or two strings of 8 and 9?

1 hour ago, Wetkit said:

With that amount of PV your battery should not discharge during the day!!!

How is you PV panels connected to the inverter?

All 17 in a single string, or two strings of 8 and 9?

@Wetkit The battery is not discharging during the day unless the there is a significant increase in load like the oven being turned on.  If charged above threshold set the Goodwe seems to use PV, then battery and supplement from grid (still getting to know the system, so my observations may not be 100% correct).   I was wondering if the kwh produced by the PV is directly equivalent to the kwH being added to the battery and vice versa when its being discharged.   I understand there would probably be losses in the conversion process from DC to AC and from PV DC volts to 48 volts.  The question was whether this type of data is stored and accessible in the SEMS portal. Is the efficiency better if PV power is used directly as required or via a battery? I would assume the first example probably the most efficient but I'm curious about the "loss", if any, via the battery (it may not be significant).

I have 2 strings one of 8, the other 9.